Source Code Cross Referenced for DecideRule.java in  » Web-Crawler » heritrix » org » archive » crawler » deciderules » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Crawler » heritrix » org.archive.crawler.deciderules 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* DecideRule
002:         *
003:         * $Id: DecideRule.java 5010 2007-03-16 15:50:55Z Gojomo $
004:         *
005:         * Created on Mar 3, 2005
006:         *
007:         * Copyright (C) 2005 Internet Archive.
008:         *
009:         * This file is part of the Heritrix web crawler (crawler.archive.org).
010:         *
011:         * Heritrix is free software; you can redistribute it and/or modify
012:         * it under the terms of the GNU Lesser Public License as published by
013:         * the Free Software Foundation; either version 2.1 of the License, or
014:         * any later version.
015:         *
016:         * Heritrix is distributed in the hope that it will be useful,
017:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
018:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
019:         * GNU Lesser Public License for more details.
020:         *
021:         * You should have received a copy of the GNU Lesser Public License
022:         * along with Heritrix; if not, write to the Free Software
023:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
024:         */
025:        package org.archive.crawler.deciderules;
026:
027:        import org.archive.crawler.framework.CrawlController;
028:        import org.archive.crawler.settings.ModuleType;
029:
030:        /**
031:         * Interface for rules which, given an object to evaluate,
032:         * respond with a decision: {@link DecideRule#ACCEPT}, 
033:         * {@link DecideRule#REJECT}, or 
034:         * {@link DecideRule#PASS}.
035:         * 
036:         * Rules return {@link #PASS} by default.
037:         *
038:         * @author gojomo
039:         * @see org.archive.crawler.deciderules.DecideRuleSequence
040:         */
041:        public class DecideRule extends ModuleType {
042:
043:            private static final long serialVersionUID = 3437522810581532520L;
044:            // enumeration of 'actions'
045:            public static final String ACCEPT = "ACCEPT".intern();
046:            public static final String REJECT = "REJECT".intern();
047:            public static final String PASS = "PASS".intern();
048:
049:            /**
050:             * Constructor.
051:             * @param name Name of this rule.
052:             */
053:            public DecideRule(String name) {
054:                super (name);
055:            }
056:
057:            /**
058:             * Make decision on passed <code>object</code>.
059:             * @param object Object to rule on.
060:             * @return {@link #ACCEPT}, {@link #REJECT}, or {@link #PASS}.
061:             */
062:            public Object decisionFor(Object object) {
063:                return PASS;
064:            }
065:
066:            /**
067:             * If this rule is "one-way" -- can only return a single
068:             * possible decision other than PASS -- return that 
069:             * decision. Otherwise return null. Most rules will be
070:             * one-way. 
071:             * @param object 
072:             * 
073:             * @return the one decision other than PASS this rule might
074:             * return, if there is only one
075:             */
076:            public Object singlePossibleNonPassDecision(Object object) {
077:                // by default, don't assume one-way
078:                return null;
079:            }
080:
081:            /**
082:             * Respond to a settings update, refreshing any internal settings-derived
083:             * state.
084:             * 
085:             * This method gives implementors a chance to refresh internal state
086:             * after a settings change. Normally new settings are picked up w/o
087:             * the need of work on the part of settings' clients but some facilities
088:             * -- for example, Surt classes need to sort submissions into
089:             * common-prefix-coalesced collection of Surt prefixes, or,
090:             * settings changes that alter external file or seeds/directives
091:             * references -- need to be flagged so they can take
092:             * compensatory action. 
093:             */
094:            public void kickUpdate() {
095:                // by default do nothing
096:            }
097:
098:            /** 
099:             * Get the controller object.
100:             *
101:             * @return the controller object.
102:             */
103:            public CrawlController getController() {
104:                return getSettingsHandler().getOrder().getController();
105:            }
106:        }
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